High 7.8Published Jul 3, 2025

CVE-2025-38111net/mdiobus: Fix potential out-of-bounds read/write access

Updated under an hour ago (Oct 27, 2026, 10:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net/mdiobus: Fix potential out-of-bounds read/write access When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via mdiobus, there is no verification of parameters passed to the ioctl and it accepts any mdio address. Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define, but it is possible to pass higher value than that via ioctl. While read/write operation should generally fail in this case, mdiobus provides stats array, where wrong address may allow out-of-bounds read/write. Fix that by adding address verification before read/write operation. While this excludes this access from any statistics, it improves security of read/write operation.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	080bb352fad00d04995102f681b134e3754bfb6e builds before 19c5875e26c4ed5686d82a7d8f7051385461b9eb; 080bb352fad00d04995102f681b134e3754bfb6e builds before 014ad9210373d2104f6ef10e6bb999a7a0a4c50e; 080bb352fad00d04995102f681b134e3754bfb6e builds before 73d478234a619f3476028cb02dee699c30ae8262; from 080bb352fad00d04995102f681b134e3754bfb6e before bab6bca0834cbb5be2a7cfe59ec6ad016ec72608; from 080bb352fad00d04995102f681b134e3754bfb6e before b02d9d2732483e670bc34cb233d28e1d43b15da4; 080bb352fad00d04995102f681b134e3754bfb6e builds before 049af7ac45a6b407748ee0995278fd861e36df8f; 080bb352fad00d04995102f681b134e3754bfb6e builds before 0e629694126ca388916f059453a1c36adde219c4	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.6 before 5.10.239; from 5.11 before 5.15.186; from 5.16 before 6.1.142; from 6.2 before 6.6.94; from 6.7 before 6.12.34; from 6.13 before 6.15.3; 6.16	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/19c5875e26c4ed5686d82a7d8f7051385461b9eb	patch
https://git.kernel.org/stable/c/014ad9210373d2104f6ef10e6bb999a7a0a4c50e	patch
https://git.kernel.org/stable/c/73d478234a619f3476028cb02dee699c30ae8262	patch
https://git.kernel.org/stable/c/bab6bca0834cbb5be2a7cfe59ec6ad016ec72608	patch
https://git.kernel.org/stable/c/b02d9d2732483e670bc34cb233d28e1d43b15da4	patch
https://git.kernel.org/stable/c/049af7ac45a6b407748ee0995278fd861e36df8f	patch
https://git.kernel.org/stable/c/0e629694126ca388916f059453a1c36adde219c4	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	mailing-list, third-party-advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	mailing-list, third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.